Jigsaw will run on any platform that supports Java, with no changes! Jigsaw has been reported to run on several platforms Jigsaw is made of a core and a set of extension modules. You can add your own modules, dynamically, to the server. Moreover, because the Java runtime comes with both threads and garbage collection, your job, as an extension writer, is largely simplified. The full code of the server is object-oriented. The interested thing is that all the resources are objects. By opposition to most of the existing servers, which consider a resource as being either a cgi script or a file. Jigsaw allows any object to become accessible via HTTP or whatever protocol implemented.
You will find here the basics on how to install and run the server.